Re: [Xen-devel] [PATCH] Add -MP to CFLAGS along with -MMD.

[David Woodhouse <dwmw2@xxxxxxxxxxxxx>]

On Tue, 2020-03-17 at 15:52 +0100, Jan Beulich wrote:
> On 17.03.2020 15:34, David Woodhouse wrote:
> > From: David Woodhouse <dwmw@xxxxxxxxxxxx>
> > 
> > This causes gcc (yes, and clang) to emit phony targets for each dependency.
> > 
> > This means that when a header file is deleted, the C files which *used*
> > to include it will no longer stop building with bogus out-of-date
> > dependencies like this:
> > 
> >    make[5]: *** No rule to make target
> >    '/home/dwmw2/git/xen/xen/include/asm/hvm/svm/amd-iommu-proto.h',
> >    needed by 'p2m.o'. Stop.
> 
> In principle this would be nice, but there must be a reason this isn't
> the default behavior. As the workaround for the issue at hand is quite
> simple, I wouldn't like to treat addressing this one by some other
> anomaly/quirk. Do you (or does anyone else) have insight into why this
> isn't default behavior?

No.

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